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  <title>返回 PHP 内置支持的图像类型</title>
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    <li><a href="index.html">PHP Manual</a></li>
    <li><a href="ref.image.html">GD 和图像处理 函数</a></li>
    <li>返回 PHP 内置支持的图像类型</li>
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  <div id="layout-content"><div id="function.imagetypes" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">imagetypes</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.2, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">imagetypes</span> &mdash; <span class="dc-title">返回 PHP 内置支持的图像类型</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.imagetypes-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>imagetypes</strong></span>(): <span class="type">int</span></div>

  <p class="para rdfs-comment">
   返回当前安装的 PHP 支持的图片类型。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.imagetypes-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>

 
 <div class="refsect1 returnvalues" id="refsect1-function.imagetypes-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   返回链接到 PHP 的 GD 版本支持的图片类型相对应的位字段。返回以下位：<strong><code>IMG_AVIF</code></strong> | <strong><code>IMG_BMP</code></strong> |
   <strong><code>IMG_GIF</code></strong> | <strong><code>IMG_JPG</code></strong> |
   <strong><code>IMG_PNG</code></strong> | <strong><code>IMG_WBMP</code></strong> | 
   <strong><code>IMG_XPM</code></strong> | <strong><code>IMG_WEBP</code></strong>.
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.imagetypes-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>8.1.0</td>
       <td>
        新增 <strong><code>IMG_AVIF</code></strong>。
       </td>
      </tr>

      <tr>
       <td>7.2.0</td>
       <td>
        新增 <strong><code>IMG_BMP</code></strong>。
       </td>
      </tr>

      <tr>
       <td>7.0.10</td>
       <td>
        新增 <strong><code>IMG_WEBP</code></strong>。
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>

 
 <div class="refsect1 examples" id="refsect1-function.imagetypes-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2710">
    <p><strong>示例 #1 检测 PNG 支持</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">if&nbsp;(</span><span style="color: #0000BB">imagetypes</span><span style="color: #007700">()&nbsp;&amp;&nbsp;</span><span style="color: #0000BB">IMG_PNG</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"PNG&nbsp;Support&nbsp;is&nbsp;enabled"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.imagetypes-seealso">
  <h3 class="title">参见</h3>
  <ul class="simplelist">
   <li class="member"><span class="function"><a href="function.gd-info.html" class="function" rel="rdfs-seeAlso">gd_info()</a> - 取得当前安装的 GD 库的信息</span></li>
  </ul>
 </div>

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